A sniper rifle that is "human controlled" by a spotter who marks valid targets seems like a no brainer thing to make.
Horrible, awful idea.
Just target acquisition alone is a fucking nightmare. You're now carrying high resolution camera, a computer to process the feed from the camera, a battery to power both; double all that if you're doing a spotter/shooter arrangement--and it'll all go to shit the second you're in a firefight.
Imagine having to dick around with some clunky targetting interface and pray to the machine spirit that the target acquisition software doesn't lose track of the bastards shooting your way because they squatted slightly and now identifies them as a Toyota Prius.
Not to mention teaching software to read the wind*, estimating distance**, etc. And if any one of these things goes wrong, the spotter has to call how off the shot was, and have the shooter adjust. You've redeveloped the traditional sniper/spotter doctrine from first principles, with the added burden of data entry in the middle of a warzone.
* No, you can't just measure wind at your location, you have to consider changes in wind across the entire flight path of the bullet. Long range shooting is an autistic science, but it has a soul.
** Yes, you can use a laser rangefinder, but you need to keep the laser on target for a set amount of time, they only work in good weather, and the laser is visible under night vision.
tldr: you're building technology dependance for no gain, sovlless bugman thinking, darpa would approve
...$3,000 every time you pull the trigger.
You could scale it down from a 20mm to a .22lr and it would do just as well against cheap Mavics and the like, but would the radar the radar even pick up the drones? How will you protect the radar from shrapnel and debris? How are you going to incorporate the CIWS into the tank?
If there was a massive amount of blind war veterans that tech would be rapidly progressed so that they can go back and fight.
In the U.S. we can hardly get our own veterans back or knee surgery--you really think we could fund the R&D for some fuckin' awesome Robocop shit like artifical eyes?